The batteries are used in metal design, but it changed the front of the mirror; Added support for auto-switch mode power simplifies the display. These and its maximum 3.1A dual output (using intelligent control function) is not the most significant feature of this series, but is it supports 2.1A input before we surprise - you know I charge the phone, the mobile power supply itself a high-power, to charge full time will be longer, if more than one hour before going out to remember not only the charge cannot be taken out to use, so that the remainder of the output current, the input current is very important too.